Bump @types/node from 18.15.11 to 18.19.130 in /backend

Bumps [@types/node](https://github.com/DefinitelyTyped/DefinitelyTyped/tree/HEAD/types/node) from 18.15.11 to 18.19.130.
- [Release notes](https://github.com/DefinitelyTyped/DefinitelyTyped/releases)
- [Commits](https://github.com/DefinitelyTyped/DefinitelyTyped/commits/HEAD/types/node)

---
updated-dependencies:
- dependency-name: "@types/node"
  dependency-version: 18.19.130
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

backend/package-lock.json

@@ -42,7 +42,7 @@
   },
   "dependencies": {
     "@mempool/electrum-client": "1.1.9",
-    "@types/node": "^18.15.3",
+    "@types/node": "^18.19.130",
     "axios": "1.13.5",
     "bitcoinjs-lib": "~6.1.3",
     "crypto-js": "~4.2.0",